Mold and bonding means



April 25, 1933. J. L. BIXBY 1,905,134

MOLD AND BONDING MEANS Filed March 14, 1931 Z v JohnL.Ba ar/Z) y, ,y fang M 39 Patented Apr. 25, 1933 UNITED STATES PATENT OFFICE.

JOHN I4. BIXBY, OF ARLINGTON, MASSACHUSETTS, ASSIGNOR TO KE-BOND COMPANY, INCORPORATED, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS MOLD AND BONDING MEANS,

Application filed March 14, 1931. Serial No. 522,687.

This invention relates to a molding form comprising plates having keys in the form of dove-tail corrugations alternating wlth dove-tail grooves, which key theplatesto plastic material, such as concrete, and whlch subsequently key another layer of plastic material, such as plaster, to the plates. In

other words, the plates which constitute parts of the molding form become parts of the completed building structure. In assembling the plates, and the supports therefor, the plates are placed edge to edge flat wise against the support, with the corrugations of one plate preferably in alignment with the corrugations of another, with the grooves of one plate in alignment with the grooves of such other plate, and with the corrugations and grooves of both plates transverse to the abutting edges of the l plates.

bodiment disclosed herein, the closing of the grooves is conveniently accomplished by flattening the corresponding corrugations adj acent to the abutting edges of the plates.

The invention will best be understood by reference to the following description, when taken in connection with the accompanying particularly in the appended claims.

In the drawing: 1

Fig. 2 is a sectional view on line 2-2 of Fig. 1; p

Fig. 3 is a sectional view on line 33 of Fig. 1; and I 1 Fig.4 is a sectional view on line 1-4015,, Fig. 1. v I r i I Referring to the drawing, and to the embodiment of the invention which is illustrated therein, there is shown a pair of bonding sheets 10, each of which is bent to present on each side dove-tail corrugations 11 (see Fig. 3), alternating with dove-tail grooves 12, each corrugation having two sloping sides 13, which overhang the contiguous grooves. In other words, each plate presents oppositely-directed, hollowdove-tail corrugations presenting grooves on opposite sides, respectively, of the plate;

r The two plates are placed fiatwise against an appropriate support 14, which may con sist of boards placed edge to edge. The plates, which are more or less flexible, may be secured to this support, and are held definitely positioned.- The plates abut edge to edge along a' line 15 (see Fig.4), which is trans-{ verse to the corrugations and grooves, and

the corrugations of one plate may be and herein are in alignment, or register with the corrugations of-the other. As plastic concrete is likely to leak through betweenthefi abutting edges of the plates and enter the grooves on the underside next to the supp'ort 14, I have closed the ends of these grooves, as by flattening the corresponding corrugations,

along abutting edges (see Figs. 2 and 4) s 80,

at 16. One convenient way of accomplishing this to place the plate in a shearing ma- V chine and tocause the movable knives of the drawing of one specific embodiment there-' 40 of, while its scope will be pointed out more machineto descend upon the corrugationswl1ich are to be flattened. The pressure of"- the knife collapses the corrugations, squ z them down, and finally severs the plate, l eaving its edge with the appearance shown in. Fig. 4. The corrugations in question di,-.

'ininish in depth (see Fig. 2) l g a curved;

line, and their edges spread slightly (see Fig. l). The edge of the sheet is left fairly smooth and straight, subject of course to some .the' invention, but withoutv Iimitingmyself c-rete, the same comprising in combination a support, and two bonding sheets disposed flatwise against said support and abutting edge to edge, each plate being bent to present on each side dove-tail corrugations alternating with dove-tail grooves transverse to said abutting edges, the grooves on the sides which are disposed toward said support being closed along said abutting edges.

In testimony whereof, I have signed my name to this specification.

' BIXB no concrete could leak into these grooves, the

bonding of the plaster to the sheets is therefore much more permanent and satisfactory than would otherwise be the case.

Having thus described one embodiment of thereto, what I claim and desire by Letters .Patent to secure is:

1. As a new article of manufacture, a bonding sheet comprising a plate having oppositely directed, hollow, dove-tail corrugations presenting grooves on opposite sides thereof, the corrugations on one side'beinguclosed along an edge which is transverse to said corru ations. o

2. As a new article of manufacture, a bonding sheet comprising a plate bent to present oppositely directed, hollow, dove-tail corrugations presenting grooves on opposite sides thereof, the corrugations on one side diminishing in depth toward an edge which is transverse to said corrugations and being closed along said edge. v

-3. As a new article of manufacture, abonding sheet comprising a plate fbent to present on each side dove-tail corrugations alternating with dove-tail grooves, each corrugation having two sloping sides which overhang .the contiguous grooves, each corrugation onone side of the plate being flat- .tened along an edge which is transverse to said corrugations and closing the correspond- I ing groove .on the other side of the .plate.

. 4.- Bonding means comprising two bonding sheets abutting edge to edge, each sheetcomprising a plate bent to present oneachslde dove-tail corrugations alternating withdove 1 '1 Ai ed tail grooves transverse to said abnttingedges, the grooves on the same side of both plates being closed along said abutting edges.

5; Bonding means coinprlsmg two bonding sheet'sabuttmgedge to edge, each sheet comprising a plate bentto present on each side dove-tail corrugations alternating with dove-tail groovestransverse to said abutting edges, the grooves on the same sideiof both iplatesbeing closed along said abuttingedges,

and means to hold said plates'in re 7 lationship.

for plastic material such as .con- 

